CN101322960B

CN101322960B - Immersed inflating and stirring device of injection type floatation cell for coal separation

Info

Publication number: CN101322960B
Application number: CN 200810054981
Authority: CN
Inventors: 吴大为; 江明东; 王微微
Original assignee: TANGSHAN GUOHUA TECHNOLOGY Co Ltd
Current assignee: BEIJING GUOHUA TECHNOLOGY GROUP LTD.
Priority date: 2008-05-16
Filing date: 2008-05-16
Publication date: 2010-09-22
Anticipated expiration: 2028-05-16
Also published as: CN101322960A

Abstract

The invention relates to a floatation machine applied to the coal dressing process, in particular to an immersion-typed aeration agitation device for jet flotation machine for coal dressing. The immersion-typed aeration agitation device comprises jet chambers, nozzles, hollow throats and air suction pipes. Arranged at the central part of a groove body of the floatation machine, connection pipes for distribution chamber are radially communicated with four jet chambers and the nozzles arranged in the jet chambers are fixedly connected with guide vanes; the external side of the jet chamber is communicated with the air suction pipe and the lower end of the jet chamber is connected with the hollow throat; the turning directions of the guide vanes of the nozzle arranged in the jet chamber at the same side of the axis of the distribution chamber are opposite; the hollow throat is a short one, the other end of which is suspended in the air; a wear-resistant liner is fixed connected with the internal wall of the short hollow throat; the upper end of the air suction pipe of the aeration agitation device extends from the liquid surface of coal paste and the remaining parts of the aeration agitation device are all immersed in the coal paste. The circulating coal paste is fed following tangent lines of different directions and a hydraulic stirring is carried out in each jet chamber to improve the aeration agitation effect. The immersion-typed aeration agitation device works reliably, has long service life, consumes less power and requires low maintenance cost.

Description

The coal separation immersion inflating and stirring device of air jet flotation machine

Technical field

The flotation device that the present invention relates in coal preparation plant, use, specifically a kind of coal separation immersion inflating and stirring device of air jet flotation machine.

Background technology

Arranged four inflating and stirring devices radially in existing FJC series coal each flotation cell with air jet flotation machine, inflating and stirring device is made up of jet chamber, nozzle, trunnion, umbrella shape disperser and air intake duct.Jet chamber and trunnion upper end are on the flotation liquid level, the circulation coal slurry is pressurizeed by circulating pump, enter in the nozzle in the jet chamber, be cast with guide vane in the nozzle, injection stream enlarges shape in the shape of a spiral from jet expansion and sprays at a high speed, produces swabbing in the jet chamber, so air sucks and wraps up in through air intake duct and is rolled onto in the injection stream, through trunnion, umbrella shape disperser, oblique fire was stirred thereby realize inflating to the false end of flotation device.

This series flotation device mainly has the following disadvantages:

1, trunnion and umbrella shape disperser are short service life.Because this two piece volumes is bigger, the general grey cast-iron material that adopts, particularly in the coal preparation plant that is provided with dense medium separation technology, influence because of cleaned coal magnetic separator technological effect, carry magnetite powder in the floatation feed to some extent, thereby aggravation wearing and tearing, so said two devices is short service time, the coal preparation plant that has even have only many time of half a year.

2, the umbrella shape disperser all is equipped with in the trunnion lower end in the inflating and stirring device of present flotation device, and the circulation coal slurry goes out from six passage oblique fires of umbrella shape disperser after stirring, and the loss portion of energy reduces jet velocity.

3, the coal slurry liquid level has all been stretched out in the center feeding pipe of existing flotation device and trunnion upper end, and a plurality of mechanical parts have hindered moving about of froth bed, influences the work effect.

Summary of the invention

Goal of the invention of the present invention is the deficiency that exists at existing flotation device inflating and stirring device, and a kind of long service life is provided, the coal separation simple in structure immersion inflating and stirring device of air jet flotation machine.

For achieving the above object, the present invention is by the following technical solutions: this coal separation is with the immersion inflating and stirring device of air jet flotation machine, comprise jet chamber, nozzle, trunnion and air intake duct, the distributor chamber that is positioned at flotation device cell body centre is communicated with four jet chambers radially with tube connector, the nozzle that is positioned at the jet chamber is connected with guide vane, the outside of jet chamber is communicated with air intake duct, the lower end of jet chamber is connected with trunnion, it is characterized in that: the nozzle guide vane rotation direction of inside, jet chamber that is positioned at distributor chamber axis the same side is opposite; Described trunnion is short trunnion, and its other end is unsettled, and the inwall of this weak point trunnion is connected with wear-resistant liner, and described inflating and stirring device is except that the coal slurry liquid level is stretched out in the upper end of air intake duct, and remaining part all is immersed in the coal slurry.

Owing to adopted technique scheme, compare with air jet flotation machine with existing FJC series coal, the present invention has the following advantages:

1, reliable operation long service life

Wear-resistant material has been adopted in nozzle and outlet thereof, this short trunnion inwall bonding corundum wear-resistant liner, what the flotation device optimal working point also can be stable remained on more than 8 years, compared the flight-line maintenance workload with the other types flotation device and reduced 90% all more than 8 years service life for whole parts.

2, the inflation mixing effect is good

Along 360 degree circumference ejections, inflation stirs the circulation coal slurry, and mixing power is big from each short trunnion.The parts that stretch out the coal slurry liquid level are few, and it is unimpeded to guarantee that froth bed moves about.

3, power consumption is low

Eliminated invalid worker's consumption that injection stream is impacted original umbrella shape disperser, reduce energy consumption, because the jet expansion diameter increases the also corresponding increase of coal slurry internal circulating load to some extent, the flotation device disposal ability increases, and assigns the 3.0kwh level by the electrical energy consumption per tonne of raw coal ordinary circumstance that pan feeding dry coal amount is calculated.

4, the parts expense is low

Replaced existing long trunnion with wear-resisting short trunnion, cancelled the umbrella shape disperser, manufacturing expense and maintenance cost reduce.

Description of drawings

Fig. 1 is an overall structure schematic diagram of the present invention.

Fig. 2 is a nozzle guide vane direction of rotation schematic diagram.

Among the figure: scrape bubble device 1, jet chamber 2, nozzle 3, distributor chamber 4 connects short tube 5, air intake duct 6, cell body 7, short trunnion 8, metal grating 9, the false end 10, center feeding pipe 11, coal slurry outlet 12.

The specific embodiment

Below in conjunction with drawings and Examples the present invention is further introduced.

Referring to accompanying drawing 1～2, in the present embodiment, described inflating and stirring device places the inside of flotation device cell body 7, and this device is made of jet chamber 2, nozzle 3, short trunnion 8 and air intake duct 6 etc.Wherein, the lower end of distributor chamber 4 that is positioned at the centre of flotation device cell body is connected with bolted with the upper end of center feeding pipe 11, its the two internal communication, cell body 7 bottoms are stretched out in the lower end of center feeding pipe 11, four jet chambers 2 of arranging radially evenly are housed on the lateral wall of distributor chamber 4, be communicated with being connected short tube 5 between this distributor chamber 4 and each jet chamber 2, be positioned on the nozzle 3 of jet chamber 2 and be connected with guide vane, wherein the rotation direction of the nozzle guide vane in two jet chambers 2 of central axis the same side of distributor chamber 4 is opposite, as shown in Figure 2, promptly wherein two jet chambers 2 feed for circulation coal slurry clockwise direction tangent line, and its inner nozzle guide vane of installing turns to and also should be clockwise direction mutually; Two jet chambers 2 feed for circulation coal slurry counter clockwise direction tangent line in addition, and its inner nozzle guide vane of installing turns to and also should be mutually counterclockwise.And the outside of each jet chamber 2 all is communicated with air intake duct 6, its lower end is connected with short trunnion 8 with bolt, paste one deck corundum (high alumina ceramic) wear-resistant liner on the inwall of this short trunnion 8, and the length of this weak point trunnion 8 is generally 1/4th of existing trunnion, its lower end is unsettled, whole device is except that the coal slurry liquid level is stretched out in the upper end of air intake duct 6, and remainder all is immersed in the coal slurry; The bottom of cell body 7 is welded with the false end 10, its with cell body 7 bottoms between metal grating 9 also is housed, coal slurry outlet 12 is located at cell body 7 bottoms, the two ends on cell body 7 tops also are equipped with respectively to scrape and are steeped device 1.

This flotation device generally is made up of 4～6 flotation cells, and per two flotation cells are provided with a circulating pump.The internal diameter of short trunnion 8, height and outlet thereof are all definite by scientific research and testing apart from the distance at the false end 10, wherein: short trunnion 8 inside diameter D=admm; Short trunnion 8 height H=bdmm; Short trunnion 8 is exported to the distance L=cdmm at the false end 10, more than in three formulas a, b, c be the test proportionality coefficient, d is the outlet diameter (mm) of the nozzle 3 of all size, can inflate stirring to coal slurry preferably.The outlet diameter that suitably adds giant 3 can also strengthen the coal slurry treating capacity, effectively reduces unit power consumption.

The course of work of the present invention is as follows:

Add flotation agent and enter first groove of flotation device through pretreated coal slurry, after inflation was stirred, the coal grain that hydrophobicity is good, ash content is low selectively sticked on the bubble, form mineralized froth, and rise and to float to liquid level and form froth bed, scrape bubble device 1 by both sides and scrape, become floatation clean coal; The coal grain that does not float floats by the groove sorting by opening successively with current, and the high ash content mineral grain of hydrophobicity difference and current are discharged from the mine tailing case of last groove.

The inflating and stirring device of this invention is immersed in the coal slurry, coal slurry flow to the circulation coal slurry pump through the bottom and the metal grating 9 at the false end 10 of flotation device cell body 7 by coal slurry outlet 12, coal slurry through the pump pressurization enters distributor chamber 4 from center feeding pipe 11 again, be divided in four jet chambers 2, under the operating pressure of setting, nozzle 3 ejections through being cast with guide vane, because the injection stream that enlarges the shape rotation has in the shape of a spiral sealed the cross section of short trunnion 8, in jet chamber 2, produced local vacuum, air through adjusting cover plate and suck by air intake duct 6 and winding up in injection stream, and by its impact, shear, be separated into bubble, the gassiness coal slurry rotates oblique fire to the false end 10 from the lower end outlet of short trunnion 8, has realized the inflation stirring to coal slurry after the false ends 10 refraction.

Claims

1. a coal separation is with the immersion inflating and stirring device of air jet flotation machine, comprise jet chamber, nozzle, trunnion and air intake duct, the distributor chamber that is positioned at flotation device cell body centre is communicated with four jet chambers radially with connecting short tube, the nozzle that is positioned at the jet chamber is connected with guide vane, the outside of jet chamber is communicated with air intake duct, the lower end of jet chamber is connected with trunnion, it is characterized in that: the nozzle guide vane rotation direction of inside, jet chamber that is positioned at distributor chamber axis the same side is opposite; Described trunnion is short trunnion, and its other end is unsettled, and the inwall of this weak point trunnion is connected with wear-resistant liner, and described inflating and stirring device is except that the coal slurry liquid level is stretched out in the upper end of air intake duct, and remaining part all is immersed in the coal slurry.

2. the coal separation according to claim 1 immersion inflating and stirring device of air jet flotation machine, it is characterized in that: the wear-resistant liner on the described short trunnion inwall is a corundum layer, the inside diameter D=admm of this short trunnion, short trunnion height H=bdmm; Short trunnion is exported to the distance L=cdmm at the false end, more than in three formulas a, b, c be the test proportionality coefficient, d is the outlet diameter of all size nozzle.